Seat and backrest for a chair



FIG. 1 is a left, front perspective view of a seat and backrest for a chair embodying our new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image thereof.

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines shown on the seat and backrest are intended to represent stitching. The broken lines depicting chair arms and a chair base are not part of the design. 

We claim the ornamental design for a seat and backrest for a chair, as shown and described. 